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分享MFC 绘制移动小球问题
小球类
对话框代码，主要是Onpaint，Onkeydown
编译通过，运行按键不移动。将UpdateWindow(); 换invalidate（true）也没用。
class ball
{
public:
int y;
int x;
ball();
virtual ~ball();
};对话框代码，主要是Onpaint，Onkeydown
class CAboutDlg : public CDialog
{
public:
CAboutDlg();
// Dialog Data
//{{AFX_DATA(CAboutDlg)
enum { IDD = IDD_ABOUTBOX };
//}}AFX_DATA
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CAboutDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL
// Implementation
protected:
//{{AFX_MSG(CAboutDlg)
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
//{{AFX_DATA_INIT(CAboutDlg)
//}}AFX_DATA_INIT
}
void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CAboutDlg)
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CDRAWDlg dialog
CDRAWDlg::CDRAWDlg(CWnd* pParent /*=NULL*/)
: CDialog(CDRAWDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CDRAWDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
void CDRAWDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CDRAWDlg)
// NOTE: the ClassWizard will add DDX and DDV calls here
//}}AFX_DATA_MAP
}
BEGIN_MESSAGE_MAP(CDRAWDlg, CDialog)
//{{AFX_MSG_MAP(CDRAWDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_WM_KEYDOWN()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CDRAWDlg message handlers
BOOL CDRAWDlg::OnInitDialog()
{
CDialog::OnInitDialog();
// Add "About..." menu item to system menu.
// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);
CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}
// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon
// TODO: Add extra initialization here
return TRUE; // return TRUE unless you set the focus to a control
}
void CDRAWDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}
// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.
void myEllipse(CDC *dc, POINT ptCenter, UINT uRadius)
{
POINT ptLeftTop, ptRightBottom;
ptLeftTop.x = ptCenter.x - uRadius;
ptLeftTop.y = ptCenter.y - uRadius;
ptRightBottom.x = ptCenter.x + uRadius;
ptRightBottom.y = ptCenter.y + uRadius;
Ellipse(*dc, ptLeftTop.x, ptLeftTop.y,
ptRightBottom.x, ptRightBottom.y);
} 画圆函数。转换为半径，圆心。
int r=20;
void CDRAWDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;
// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
int x=0;
CDialog::OnPaint();
CDC *pDC =GetDC();
CBrush brushColor(RGB(255,255,0));//填充的颜色
CPen penColor;
penColor.CreatePen(PS_SOLID,1,RGB(0,64,128));//边框颜色
pDC->SelectObject(penColor);
pDC->SelectObject(brushColor);
CPoint p(b.x,b.y);
myEllipse(pDC,p,r);
brushColor.DeleteObject();
penColor.DeleteObject();
ReleaseDC(pDC);
}
}
// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CDRAWDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}
void CDRAWDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
switch(nChar)
{
case VK_LEFT://按下左键
b.x=b.x-10;
UpdateWindow();
break;
case VK_RIGHT://按下右键
b.x=b.x+10;
UpdateWindow();
break;
case VK_UP://按下上键
b.y=b.y+10;
UpdateWindow();
break;
case VK_DOWN:// 按下下键
b.y=b.y-10;
UpdateWindow();
break;
default:
break;
}
}
编译通过，运行按键不移动。将UpdateWindow(); 换invalidate（true）也没用。
...全文
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jimette 2013-02-28
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UpdateWindow 是你自己写的？
shen_wei 2013-02-28
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int nPosX,nPosY;
void CCMoveBallView::OnDraw(CDC* pDC)
{
CCMoveBallDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
if (!pDoc)
return;
CBrush bush(RGB(255,0,0));
pDC->SelectObject(bush);
CPen pen(PS_SOLID,2,RGB(255,0,0));
pDC->SelectObject(pen);
pDC->Ellipse(CRect(nPosX,nPosY,nPosX+20,nPosY+20));
}
void CCMoveBallView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
switch(nChar)
{
case VK_UP:
nPosY -=10;
break;
case VK_DOWN:
nPosY +=10;
break;
case VK_LEFT:
nPosX -=10;
break;
case VK_RIGHT:
nPosX +=10;
break;
}
this->Invalidate();
CView::OnKeyDown(nChar, nRepCnt, nFlags);
}
不知名的悲伤 2013-02-27
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OnPaint()
CDC *pDC =GetDC();
CBrush brushColor(RGB(255,255,0));//填充的颜色
CPen penColor;
penColor.CreatePen(PS_SOLID,1,RGB(0,64,128));//边框颜色
pDC->SelectObject(penColor);
pDC->SelectObject(brushColor);
OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
CPoint p(b.x,b.y);
myEllipse(pDC,p,r);
brushColor.DeleteObject();
penColor.DeleteObject();
ReleaseDC(pDC);void myEllipse(CDC *dc, POINT ptCenter, UINT uRadius)
{
POINT ptLeftTop, ptRightBottom;
ptLeftTop.x = ptCenter.x - uRadius;
ptLeftTop.y = ptCenter.y - uRadius;
ptRightBottom.x = ptCenter.x + uRadius;
ptRightBottom.y = ptCenter.y + uRadius;
Ellipse(*dc, ptLeftTop.x, ptLeftTop.y,
ptRightBottom.x, ptRightBottom.y);
}void CDRAWDlg::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
CDialog::OnKeyDown(nChar, nRepCnt, nFlags);
switch(nChar)
{
case VK_LEFT://按下左键
b.x=b.x-10;
UpdateWindow();
break;
case VK_RIGHT://按下右键
b.x=b.x+10;
UpdateWindow();
break;
case VK_UP://按下上键
b.y=b.y+10;
UpdateWindow();
break;
case VK_DOWN:// 按下下键
b.y=b.y-10;
UpdateWindow();
break;
default:
break;
}
}